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<br />. <br /> <br />" <br /> <br />the 1985 study period will be compared with the long-term normals from <br />earlier years. <br />An analysis of the NCAR C-band radar data will be made to determine <br />the precipitation echo type (PET) dominant over the Tushar Mtns each <br />half-hour. The analysis will use copies of video cassette recordings of <br />the radar data displayed on one of the color monitors in the radar van. <br />A half-hourly classification will be made rather than the hourly classi- <br />fication of 1983 in order to resolve the frequent temporal changes in <br />PET which can occur and to provide more precise information on the dura- <br />tion of a PET. Mean soundings for each PET will be calculated using the <br /> <br /> <br />Adamsville rawinsonde data. The time of occurrence of each PET relative <br /> <br />to FROPA and CIRPA will be determined. A summary will be made of the <br /> <br /> <br />PETs occurring in each STORM. <br /> <br /> <br />b. Seeding material delivery experiments <br /> <br />Lead Scientist: Don A. Griffith, NAWC <br /> <br /> <br />Participating Scientists: Richard Benner, H. Robert Swart, NAWC <br /> <br />The analyses will focus on the sulfur hexafluoride (SF6) con- <br /> <br /> <br />centration data and on the constant volume balloon trajectories. The <br /> <br /> <br />two kinds of data will be examined separately and jointly. <br /> <br /> <br />The SF6 analysis will be based on tabulations of SF6 concentrations <br /> <br />versus time measured at a number of sites on and near the slopes of the <br /> <br />Tushar Mtns. Significant concentrations (those above the noise level) <br /> <br />will be due to dry deposition of the material and to wet deposition or <br /> <br />scavenging of the material by precipitation. Significant concentrations <br /> <br /> <br />are not due to any ice-nucleating ability of the SF6. SF6 is inert in <br /> <br />this important respect and thus differs significantly from silver <br /> <br />iodide. <br /> <br />.! <br /> <br />. <br /> <br />. <br /> <br />,e <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />16 <br /> <br />. <br />